Earth moving device



Aug. 20, 1946.

V. L. SCHIELD EARTH MOVING DEVICE Filed Feb. 26; 1944 mamas 4 SheetS-Sheet 1 INVENTQR. l/E/PN L. 50/1540 ATTOIP/VEX Aug. 20, 1946. v, LS HIEL 05,

EARTH MOVING DEVICE VE/P/V L. JCH/ELD ATT/PNEK A 2@ 1 v. L. SC-HELD 2,40 981 EARTH MOVING DEVICE Filed Feb. 26, 1944 4 Sheets-Sheet s INVENTOR. l/E/PN L. JCH/ELO AITTOPNEY.

Patented Aug. 20, 1946 FFICE EARTH. MOVING DEVICE Vern L. Schield, Waverly, Iowa Application February 26, 1944, Serial No. 523,998

3 Claims. 1

This invention relates to earth moving devices and has particular reference to an excavating,

dirt moving and material handling device.

While many devices of the excavating shovel ype have been proposed for large scale earth moving, such devices have been for the main part large, heavy, especially designed and constructed machines which are notoriously expensive to buy and maintain.

It. is a particular object and an important object of my invention. to provide a small machine constructed of readily available units and parts which, by reason of their use for other purposes, are low in first cost and maintenance, so as to make available to the public a low cost machine which is relatively light and small but which can nevertheless do many of the common excavating jobs for which the large machines are too expensive: to operate.

Still another object of my invention is to provide a machine adapted to be mounted on any ordinary conventional long Wheel base truck chassis so as to eliminate the necessity for a special built truck or heavy expensive caterpillartype tractor or carrier.

Still another object of my invention to provide a device which is readily adaptable for use with a large variela/ of attachments such as drag lines, cranes, ditching machines, trench hoes; excavating shovels and the like.

Still another object of my invention is to pro- Other and further features and objects of the invention will be more apparent to those skilled in the art upon a consideration of the accompanying drawings and following specifications, wherein is disclosed a single exemplary embodiment of the invention, with the understanding, however, that such changes may be made therein as fall within the scope of the appended claims, Without departing from the spirit of the inven tion.

In said drawings:

Figure l is a view in perspective of a device constructed according to one embodiment of my invention.

Figure 2 is a view, partly in side elevation and partly in section, of the turntable of the device shown in Figure 1.

Figure 3. is a plan view of the turntable of the structure shown in Figures 1 and 2.

Figure 4 is a view in section of the turntable and bull ring shown in Figures. 2 and 3.

Figure 5 is a view, partly in section and partly in elevation, illustrating the turntable drive and the control means for controlling the swing of the turntable and the movement of the dipper stick, or other excavating means, and

Figure 6' is a. view in elevation of a. clutch fork for use with the clutches of the. turntable swing mechanism.

Referring now more particularly to Figure l; a device constructed according to my invention may be mounted on a mobile basesuch as. the stripped chassis of a truck such as illustrated at lit. The device of course could be mounted on a tractor or the like in the manner I am about to describe.

In mounting the device on the rear of a truck I preferably employ a pair of H-' channels it and I2 secured to the upper faces of the side. members of the truck frame to reinforce the members and toactas a means for securing the channelled ring l3 on the truck. This channelled ring is of particular importance and a considerable portion of the cost of manufacturing a device of this character is saved by utilizing an ordinary steel channel which is rolled into a ring. This ring thus provides not only a circular path on which rollers 24 roll but also provides a circular lip or flange [5 for the hook roller I51 to roll under to keep the machine from tipping.

To the inner face of the channel member [3 I secure an internal gear or bull gear [4. This gear is preferably bolted in place so that it can be replaced and this bull gear is readily available on the open market without the necessity of using a specially constructed and cut gear.

A rectangular frame having side member It and end members H is mounted for rotation about the axis of the bull gear by means of a through shaft, center pin or-king pin It.

The center pin [8 is rotatably mounted insleeve bearings: t9 and 21. The sleeve bearing I9 is secured to crossmembers 22 which are in turnsecured to the channel member [3.

The bearing member 21 is secured to a cross member 23 which is in turn secured to the side frame members I 6 of the turntable frame.

Rollers 24 are provided which are rotatably mounted in turn-table frame stiffening members 26' and these rollers roll on the bull ring l3. A plan view of the various members'just described is shown inFigure 3'. The turntable frame It and I1 is thus free to rotate on the flange of the steel channel ring, and held in place by the king pin t8- A power means, such as the internal combus tion engine, illustrated at 30, is mounted on an engine irame' 31 mounted above the turntable frame It. The unit here illustrated is a hoist unit commonly used for elevating building material in erecting buildings, and includes two drums mounted in side frame members 32, these drums being driven from the power unit 38 through a chain drive such as that enclosed in the housing 33; These units are provided with the drums 34 and 38. and; the drum 36 has an extension haft 3'! projecting beyond the side of the frame which I utilize in rotating or swinging the turntable.

.boom or A frame 6 l. I

The means for rotating the turntable includes a sprocket 38, a chain 39, and sprockets 4|, the sprocket 4| being mounted upon a cross shaft or swing shaft 42 in bearings43; which in turn are secured on channel members 44. l

The shaft 42 is provided with oppositely disposed clutches 46 and 41 and these clutches are connected through the links 48 to the control member 49 to be selectively engaged to rotate the turntable in one direction or the other as desired. Rotation of the turntable is Y effected through the bevel gears or 52 which selectively drive the bevel gear 53 in one direction or the other to rotate the spur gear 54 in one direction or the other as desired. The spur gear 54 isin mesh with the bull gear l4 and since the shaft 56 on which the spur gear and bevel gear are mounted is rotatably mounted in a bearing 51 on the turntable frame; rotation of the turntable in one direction or the other as desired is secured. A clutch fork 50 is shown in Figure 6 by which the clutch collars 55 are shifted.

An A frame or boom BI is pivotally'mounted on the end of the turntable frame opposite to the power unit by means of pins 62 and projects outwardly therefrom.

I preferably mount a mast structure on the turntable frame by means of the A shaped sheave support frame 63; the mast members 64, 66, struts cable 16 which is reeved over the cat-head sheave H, the boom head 18, and dead ended on the If the clutch 13 is engaged, the drum or sheave 3B is rotated in one direction or the other to either reeve in the line 19 or let it out to thus swing the stick 8| which is pivotally mounted on the end of the boom 6 l. The dipper stick 8| may carry the ditching bucket 82 or a conventional excavating shovel. The clutches l3 and 14 are controlled by means of control handles 83 and 84 through any suitable linkages; as shown. Foot pedals 85 may be utilized for braking the sheaves 34 and 36.

Obviously since two lines are available, a crane may be mounted in the place of the A frame GI and one line used to raise and lower the boom and the other line used to raise and lower a load.

In the same manner a drag line may be rigged up and operated from the structure here shown. The entire turntable may be rotated as desired, so that a load may be picked up and loaded in the wagon f or truck or disposed in a pile as desired.

It is apparent that I have provided a machine which may be moved from one job to another at a minimum of expense and time. This effects a material saving in the overall cost of a job and permits the machine to accomplish many The parts are easy to get at for repair A machine constructed according to my invention permits mounting of the operating machinery well back of the center of gravity so that the need for dead counterweights is eliminated and the machinery itself acts as a live counterweight.

Although I have described a specific embodi- 'ment of my invention, it is apparent that modifications thereof may be made by those skilled in the art. Such modifications may be made without departing from the spirit and scope of my invention as set forth in the appended claims.

I claim as my invention:

1. In an earth working device of the character described, a truck having a rear axle and rear supporting and driving wheels, and a chassis frame, a turntable mounted on the rear of said frame substantially over the rear axle and including a forwardly extending frame, an elevator hoist unit mounted on the forward end of said turntable frame, a boom pivoted at its inner end to the rear end of said turntable frame and extending generally rearwardly, a mast structure fixedly carried at the rear end of said turntable frame and extending substantially directly upwardly therefrom and generally above said rear axle in substantially all positions of said turntable, and cable means extending between said hoist and boom and trained over the upper end of said mast structure.

2. In an earth working device of the character described, a truck having a rear axle and a chassis frame, a turntable mounted on the rear of said frame substantially over the rear axle and including a forwardly extending frame, an elevator hoist unit having two driving drums and mounted on the forward end of said turntable frame, a boom pivoted at its inner end to the rear end of said turntable frame and extending generally rearwardly, a mast structure carried at the rear end of said turntable frame and extending substantially directly upwardly therefrom generally above said rear axle in all position of said turntable, a first cable means extending between said hoist unit and boom and trained over the upper end of said mast-structure, and a second cable means extending directly from said hoist unit to a dipper stick carried by said boom, one of said cable means being connected with one of said driving drums and the other cable means being connected with the other of said driving drums.

3. In an earth working device of the character described, a truck, a turntable mounted generally over the rear wheels thereof and including a forwardly extending frame, an elevator hoist unit mounted on the forward end of said turntable frame, a boom pivoted at its inner end to the rear end of said turntable frame and extending generally rearwardly therefrom; a mast structure including an A frame extending substantially vertically from the rear end of the said turntable frame, a freely rotatable sheave mounted in the upper portion of said A frame; a bracing struc ture for the A frame including struts mounted, at their lower ends adjacent the lower ends of the A frame and diverging upwardly and forwardly away from the A frame and the struts, and tension members extending from the upper end of the struts forwardly and downwardly to the forward end of the turntable; and a cable extending between said hoist and said boom and trained over the said sheave.

VERN L. SCHIELD. 

